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what is the difference between 3,4 wire RTD sensor?
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Answer Posted / niranjan
RTD is inherently a 2-wire device, A 2-wire RTD can be used with either a 3 or a 4 -wire instrument by jumping the appropriate terminals.3-wire instrument, a 4-wire RTD will not provide any better accuracy. If the fourth wire is not connected, the device is only as good as the 3-wire RTD; if the fourth wire is connected, new errors will be introduced. Connecting a 3-wire RTD to a 4-wire instrument can cause serious errors or simply not work at all, depending on the instrument circuitry.
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